This is my /etc/X11/Xsession.d/80zhone. As you can see the erlang node's got a name "-sname moko" (a running erlang virtual machine is called an erlang node). And it's got a cookie "-setcookie SFEWRG34AFDSGAFG35235".

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This is my /etc/X11/Xsession.d/80zhone. As you can see the erlang node's got a name "-name neo" (a running erlang virtual machine is called an erlang node). And it's got a cookie "-setcookie SFEWRG34AFDSGAFG35235".

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Revision as of 18:31, 5 December 2008

To change a running system

Start erlang as a node

This is my /etc/X11/Xsession.d/80zhone. As you can see the erlang node's got a name "-name neo" (a running erlang virtual machine is called an erlang node). And it's got a cookie "-setcookie SFEWRG34AFDSGAFG35235".

Every erlang node in your network should have a unique name, and a common cookie. Start an erlang node on your host PC with a unique name and the common cookie:

erl -setcookie SFEWRG34AFDSGAFG35235 -name 'host@192.168.0.200'

From your host erlang console try

net_adm:ping('neo@192.168.0.202').

The response should be 'pong' if you have a successful connection - if not the response is 'pang'

Then try the shell command

nodes().

The response should be a list of all known nodes in your network.

Load the code

To carry out Hot Code Loading you start a an erlang node on your host (remember to set a different name and to use the same cookie) and from the host erlang shell type nl(your_modulename). Substitute your_modulename with the name of the module you want to load into the virtual machine.

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To change a running system

Start erlang as a node

This is my /etc/X11/Xsession.d/80zhone. As you can see the erlang node's got a name "-sname moko" (a running erlang virtual machine is called an erlang node). And it's got a cookie "-setcookie SFEWRG34AFDSGAFG35235".

Every erlang node in your network should have a unique name, and a common cookie. Start an erlang node on your host PC with a unique name and the common cookie:

erl -setcookie SFEWRG34AFDSGAFG35235 -name 'host@192.168.0.200'

From your host erlang console try

net_adm:ping('neo@192.168.0.202').

The response should be 'pong' if you have a successful connection - if not the response is 'pang'

Then try the shell command

nodes().

The response should be a list of all known nodes in your network.

Load the code

To carry out Hot Code Loading you start a an erlang node on your host (remember to set a different name and to use the same cookie) and from the host erlang shell type nl(your_modulename). Substitute your_modulename with the name of the module you want to load into the virtual machine.